• CN:11-2187/TH
  • ISSN:0577-6686

›› 2004, Vol. 40 ›› Issue (3): 31-34.

• 论文 • 上一篇    下一篇

有源静电轴承的动刚度特性研究

韩丰田;高钟毓   

  1. 郑州大学机械工程学院;清华大学
  • 发布日期:2004-03-15

DYNAMIC STIFFNESS OF ACTIVE ELECTROSTATIC BEARINGS

Han Fengtian;Gao Zhongyu   

  1. Zhengzhou University Tsinghua University
  • Published:2004-03-15

摘要: 针对补偿负刚度后的静电轴承-转子系统模型,讨论了PID控制参数与动刚度特性的关系,为根据刚度指标确定控制参数提供了理论依据。对三自由度静电球轴承的动刚度分析与实验结果表明,系统在低频与高频段具有较高的支承刚度,而中频刚度较低,刚度幅频特性曲线呈“浴盆”状。在系统通频带内,动态刚度主要由控制器参数决定, 而高频刚度主要取决于转子的惯性项。在系统稳定区域,改变控制器参数可以灵活设定系统的动刚度特性。

关键词: PID控制, 动刚度, 静电悬浮, 静电轴承, 故障诊断, 航空发动机, 时频分析, 同步压缩变换

Abstract: The relationships between dynamic stiffness properties and PID parameters of active electrostatic bearing and rotor systems based on a stiffness compensated model are investigated. The analytical and experimental results via a three-degrees of freedom electrostatic bearing supporting a spherical rotor demonstrated that the frequency response curve of the bearing stiffness is in a bathtub shape with a minimum value in intermediate frequency range. The dynamic stiffness is mostly determined by controller parameters within the closed-loop bandwidth of electrostatically levitated systems, while the stiffness above the system bandwidth is determined by the inertial stiffness of the rotor. As a result, the stiffness properties may be varied over a certain range by changing the controller parameters within the stable region.

Key words: Dynamic stiffness, Electrostatic bearing, Electrostatic levitation, PID control, Aero-engine, Fault diagnosis, Synchrosqueezing transform, Time-frequency analysis

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